Centrifugal model tests on excavation of twin parallel tunnels
MIAO Lin-chang1, WANG Fei1, Charles W. W. Ng2, LÜ Hu2
1. School of Transportation, Southeast University, Nanjing 210096, China; 2. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China
Abstract：The excavation construction of twin parallel tunnels is simulated by using centrifugal model tests. The internal stress and deformation variation of shield structure of the existing tunnel and the ground surface settlement are studied owing to excavation of the new adjacent tunnel. The research results show that: (1) The ground surface settlement relates with the tunnel excavation process, and the settlement trough range is independent of the tunnel excavation process. (2) The shield structure side of the existing tunnel near to the new constructing tunnel is subjected to tension and the bending moment at the same side of the existing tunnel has a negative increment, the transverse diameter increases, and the lateral earth pressure decreases at the same side of the shield near to the new construction tunnel. However, the vertical diameter of the shield structure of the existing tunnel is not affected. (3) The crown earth pressure of the just completed shield firstly decreases and then increases during the sequent excavation process. (4) The proposed method for the stratigraphic structure by the authors can be used to analyze the internal stress and deformation of the shield structure for tunnel construction.
缪林昌, 王非, 吴宏伟, 吕虎. 平行盾构开挖离心机模拟试验研究[J]. 岩土工程学报, 2017, 39(2): 373-379.
MIAO Lin-chang, WANG Fei, Charles W. W. Ng, LÜ Hu. Centrifugal model tests on excavation of twin parallel tunnels. Chinese J. Geot. Eng., 2017, 39(2): 373-379.
[1] TAYLOR R N. Geotechnical centrifuge technology[M]. London: Blackie Academic & Professional, 1995. [2] 周小文, 濮家骝. 隧洞结构受力及变形特征的离心模型试验研究[J]. 清华大学学报, 2001, 41(8): 110-113. (ZHOU Xiao-wen, PU Jia-liu. Centrifuge medel test study of the earth pressure and deformation of tunnel lining[J]. Journal of Tsinghua University, 2001, 41(8): 110-113. (in Chinese)) [3] 周小文, 濮家骝. 砂土中隧洞开挖引起的地面沉降试验研究[J]. 岩土力学, 2002, 23(5): 559-563. (ZHOU Xiao-wen, PU Jia-liu. Centrifuge model test on ground settlement induced by tunneling in sandy soil[J]. Rock and Soil Mechanics, 2002, 23(5): 559-563. (in Chinese)) [4] 凌 昊, 仇文革, 孙 兵, 等. 双孔盾构隧道近接施工离心模型试验研究[J]. 岩土力学, 2010, 31(9): 2849-2853. (LING Hao, QIU Wen-ge, SUN Bing, et al. Study of adjacent construction of two tube shield tunnels by centrifugal model test[J]. Rock and Soil Mechanics, 2010, 31(9): 2849-2853. (in Chinese)) [5] ADDENBROOKE T L, POTTS D M. Twin tunnel interaction: surface and subsurface effects[J]. Int J Geomech, 2001, 1(2): 249-271. [6] NG W W C, BOONYARAK T, MASIN D. Effects of pillar depth and shielding on the interaction of crossing multitunnels[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2015, 141(6): 04015021.
